Identity stays intact
U.S.-delivered NAS, Japan-spec / J-NAS, ROW and NAS-VIN major rebuilds are separate identities. Current U.S. location does not rewrite original market specification.
Original delivery market, import path and current U.S. title status remain distinct fields.
Comparable cohorts narrow in order
Body, year, identity, original delivery market, import path, originality or restoration, drivetrain, chassis condition, mileage, then color and meaningful specification.
Imported trucks can appear beside NAS alternatives, but they do not enter a U.S.-delivered NAS median unless the user explicitly selects the broader cohort.
Vehicle and event are separate
The same physical truck keeps one Vehicle ID. Each return to market creates a new Market Event. A continuous listing keeps the same event and adds price observations.
Venue and discovery source remain separate. Unknown is never converted to no.
Charts earn their space
Scatter plots require at least five valid observations. Identity trends require at least eight observations and enough mileage dispersion. Time series require at least three distinct periods.
Malformed or suspicious prices are withheld from charts and medians until validated. When the sample is thin, the underlying records replace the chart.
Asks and bids stay separate
Dealer and private-party points are asking prices. Auction points are current bids and use a distinct marker; they never enter an asking-price median.
Ask trends use identity-specific cohorts. Ask-versus-sold comparisons require the same body, year, market identity and broad originality or restoration class, with adequate observations on both sides.